Dell Dementions B110 The unit powers on all fans come on. Note: It was very dusty inside. On the screen the Dell boot up shows up for a second and goes off then comes back on then goes off again. It just keeps doing that. At the Power button there are two lights the one on the left starts orange then goes right to green and stays green. The light on the right will later come on green then go out and then come back on and then out etc.?